Spent fuel transfer system

Abstract

The invention provides a spent fuel transfer system, a nuclear power station comprises a spent fuel storage water tank, two unloading water tanks and at least two first water channels, and the spent fuel transfer system comprises at least two first transfer devices, at least one second transfer device and at least two first transfer trolleys; the two unloading water tanks are respectively communicated with the spent fuel storage water tank through at least two first water channels, at least one first water channel is arranged between one unloading water tank and the spent fuel storage water tank, a first transfer trolley is arranged in each first water channel, and the first transfer trolleys can move in the first water channels; the first transfer devices are arranged above the unloading water tank, at least one first transfer device is arranged above one spent fuel storage water tank, and the second transfer device is arranged above the spent fuel storage water tank. The spent fuel transfer device can improve the spent fuel transfer efficiency.

Description

Technical Field

[0001] The present application relates to the field of nuclear power engineering, and in particular to a spent fuel transfer system. Background Art

[0002] Spent fuel storage and transfer primarily utilizes wet storage in fixed spent fuel storage racks. This storage method operates on a single fuel assembly basis, with incoming spent fuel being hoisted directly and stored in the spent fuel storage racks within the storage pool. However, this storage method, with its relatively small daily processing capacity, is unable to meet the processing capacity requirements of future reprocessing plants and requires a larger spent fuel pool depth, increasing construction and operating costs. Based on the processing capacity of future spent fuel reprocessing plants, approximately 9-12 spent fuel assemblies will need to be processed daily. If the traditional storage rack method were still used, gantry cranes would be required to transfer spent fuel assemblies to the headend processing facility 9-12 times daily. Transferring individual assemblies takes a long time, is inefficient, and the risk of assemblies falling increases exponentially. The basket method eliminates the need to lift spent fuel assemblies out of the basket during transfer, requiring a smaller pool depth than the grid method. The spent fuel storage pool depth can be reduced to approximately 9 meters, reducing water consumption by one-quarter compared to grid storage. The same storage capacity will help reduce the impact of pool load on buildings, while the cost of deionized water production, pool water cooling and pool water purification will be reduced.

[0003] The intelligent and continuous operation of the spent fuel operation and transfer process is the most direct reflection of the spent fuel operation and transfer processing capabilities of the reprocessing plant. In order to improve the spent fuel processing throughput and storage capacity of a reprocessing plant and to cooperate with the construction of a new spent fuel receiving and storage system in the reprocessing plant to realize a closed-loop storage and transportation solution for the reprocessing plant, the prior art, such as CN217894942U, proposes a reprocessing plant system, including an unloading pool, a spent fuel pool, a first spent fuel operation and transfer device, and a second spent fuel operation and transfer device. The first spent fuel operation and transfer device is arranged above the unloading pool, and the second spent fuel operation and transfer device is arranged above the spent fuel pool. The unloading pool and the spent fuel pool are connected by a waterway, and a transfer vehicle is provided in the waterway. The first spent fuel operation and transfer device is used to load spent fuel assemblies in the unloading pool into a storage and transportation basket and transfer the storage and transportation basket containing the spent fuel assemblies to the transfer vehicle on the waterway. The transfer vehicle is used to transport the storage and transportation basket containing the spent fuel assemblies to the spent fuel pool. The second spent fuel operation and transfer device is used to lift the storage and transportation basket containing the spent fuel assemblies from the transfer vehicle into the spent fuel pool for storage.

[0004] However, the existing technologies cannot completely solve the above problems. Summary of the Invention

[0005] The purpose of this application is to solve the above technical problems.

[0006] To achieve the above-mentioned objectives, the present application provides a spent fuel transfer system in a first aspect. The nuclear power plant includes a spent fuel storage pool, two unloading pools, and at least two first water channels. The spent fuel transfer system includes at least two first transfer devices, at least one second transfer device, and at least two first transfer carts. The two unloading pools are respectively connected to the spent fuel storage pool through at least two first water channels. At least one first water channel is provided between one of the unloading pools and the spent fuel storage pool. A first transfer cart is provided in each of the first water channels, and the first transfer cart is capable of moving in the first water channel. The first transfer device is provided above the unloading pool, at least one first transfer device is provided above one of the spent fuel storage pools, and the second transfer device is provided above the spent fuel storage pool. The first transfer device can grab the spent fuel in the unloading pool and place it in the first transfer cart. The second transfer device grabs the spent fuel in the first transfer cart and places it into the spent fuel storage pool.

[0007] Furthermore, the height of the bottom surface of the spent fuel storage pool is higher than the height of the bottom surface of the unloading pool, and the angle between the upper surface of the first water channel and the horizontal plane is between 20° and 30°.

[0008] Furthermore, the spent fuel in the unloading pool is stored in the form of spent fuel assemblies, which are loaded into a hanging basket and transported to the spent fuel storage pool. The first transfer device includes a fuel assembly gripper and a hanging basket gripper. The first transfer device grabs the fuel assembly in the unloading pool through the fuel assembly gripper and places it into the hanging basket. The first transfer device grabs the hanging basket through the hanging basket gripper and places it into the first transfer trolley.

[0009] Furthermore, the first transfer device includes a unloading trolley and a unloading cart, the unloading trolley can move along the unloading cart, the hanging basket gripper and the spent fuel assembly gripper are both arranged on the same unloading trolley, and the central axes of the hanging basket gripper and the spent fuel assembly gripper extend in the vertical direction and are parallel to each other.

[0010] Furthermore, the spent fuel assembly gripper includes a spent fuel assembly fixed sleeve, a spent fuel assembly telescopic sleeve, and a spent fuel assembly grab hook. The spent fuel assembly fixed sleeve is fixed to the unloading trolley, and the spent fuel assembly grab hook is arranged at the lower end of the spent fuel assembly telescopic sleeve. The spent fuel assembly telescopic sleeve can move along the spent fuel assembly fixed sleeve; the hanging basket gripper includes a hanging basket fixed sleeve, a hanging basket telescopic sleeve, and a hanging basket grab hook. The hanging basket fixed sleeve is fixed to the unloading trolley, and the hanging basket grab hook is arranged at the lower end of the hanging basket telescopic sleeve. The hanging basket telescopic sleeve can move along the hanging basket fixed sleeve.

[0011] Furthermore, the cross-sections of the spent fuel assembly fixing sleeve and the spent fuel assembly telescopic sleeve along the horizontal plane are circular, and the cross-sections of the hanging basket fixing sleeve and the hanging basket telescopic sleeve along the horizontal plane are quadrilateral.

[0012] Furthermore, the spent fuel assembly gripper further comprises a spent fuel assembly lifting mechanism, the spent fuel assembly lifting mechanism being fixed to the unloading trolley and being located above the unloading trolley, the spent fuel assembly lifting mechanism being capable of driving the spent fuel assembly telescopic sleeve to move in a vertical direction along the spent fuel assembly fixed sleeve, and the spent fuel assembly lifting mechanism being capable of driving the spent fuel assembly grab hook to rotate along a vertical axis;

[0013] The hanging basket grab also includes a hanging basket lifting mechanism, which is fixed to the unloading trolley and located above the unloading trolley. The hanging basket lifting mechanism can drive the hanging basket telescopic sleeve to move in the vertical direction along the hanging basket fixed sleeve, and the hanging basket lifting mechanism can drive the hanging basket grab hook to rotate along the vertical axis.

[0014] Furthermore, the spent fuel assembly lifting mechanism is a hydraulic lifting mechanism or a wire rope lifting mechanism, and the hanging basket lifting mechanism is a hydraulic lifting mechanism or a wire rope lifting mechanism.

[0015] Furthermore, the nuclear power plant also includes a head-end processing facility and at least two second water channels, and the spent fuel transfer system also includes at least two second transfer carts. The second water channel connects the spent fuel storage pool and the head-end processing facility. At least two second water channels are arranged between the spent fuel storage pool and the head-end processing facility. A second transfer cart is arranged in each second water channel, and the second transfer cart can move in the second water channel; the second transfer device includes a second hanging basket grab, and the second transfer device grabs the hanging basket in the spent fuel storage pool through the second hanging basket grab and places it into the second transfer cart.

[0016] Further, the section of the spent fuel storage pool opening is rectangular, the first water channel and the second water channel extend in a direction perpendicular to the long side direction of the spent fuel storage pool, and the connection of the spent fuel receiving area from the discharge pool and the spent fuel storage pool to the head-end processing facility is perpendicular to the long side direction of the spent fuel storage pool.

[0017] Further, the height of the bottom surface of the head-end processing facility is higher than the height of the bottom surface of the spent fuel storage pool, and the angle between the upper surface of the second water channel and the horizontal plane is between 25° and 30°.

[0018] Further, the upper surfaces of the first water channel and the second water channel are each provided with a guide rail, and the first transfer trolley and the second transfer trolley are each provided with a roller.

[0019] Further, the nuclear power plant comprises two first water channels and two second water channels, and the spent fuel transfer system comprises two first transfer trolleys, two second transfer trolleys, two first transfer devices, and one second transfer device.

[0020] Further, the first transfer device and the second transfer device do not lift the spent fuel assembly or the basket above the water surface during the process of grabbing the spent fuel assembly or the basket, and the first transfer trolley and the second transfer trolley do not lift the basket above the water surface during the process of transporting the basket.

[0021] The above technical solutions of the present application achieve at least the following technical effects:

[0022] 1. The present application comprises two discharge pools and one spent fuel storage pool, the two discharge pools are respectively connected with the spent fuel storage pool through at least two first water channels, and at least one first water channel is arranged between one discharge pool and the spent fuel storage pool. The two discharge pools and the at least two first water channels can work simultaneously or partially, and the other part can be used as a backup, which greatly improves the efficiency of spent fuel transfer.

[0023] 2. In the present application, the first transfer device comprises a fuel assembly grabber and a basket grabber, the first transfer device puts the fuel assembly in the discharge pool into the basket through the fuel assembly grabber, and the first transfer device puts the basket into the first transfer trolley through the basket grabber. Not only simplifies the complexity of the corresponding transfer device of the discharge pool, but also improves the efficiency of spent fuel transfer.

[0024] 3. In the present application, the second transfer device only grabs the basket and does not need to plug and pull the spent fuel assembly. Under the condition of a certain thickness of the radiation shielding water layer, the depth of the spent fuel storage pool can be correspondingly reduced to reduce the influence of the load of the spent fuel storage pool on the building.

[0025] Additional aspects and advantages will be given in part in the description that follows and in part will be obvious from the description that follows, or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 A layout diagram of an unloading pool and a spent fuel storage pool in one embodiment is shown;

[0028] Figure 2 A cross-sectional view of an unloading pool and a spent fuel storage pool in one embodiment is shown;

[0029] Figure 3 A schematic diagram of a first transfer device in one embodiment is shown;

[0030] Figure 4 A schematic diagram of a second transfer device in one embodiment is shown;

[0031] Figure 5 A first transfer trolley in one embodiment is shown;

[0032] Figure numerals: 1. unloading trolley; 2. unloading trolley; 3. spent fuel assembly grab; 31. spent fuel assembly fixing sleeve; 32. spent fuel assembly telescopic sleeve; 33. spent fuel assembly grab hook; 34. spent fuel assembly lifting mechanism; 4. hanging basket grab; 41. hanging basket fixing sleeve; 42. hanging basket telescopic sleeve; 43. hanging basket grab hook; 44. hanging basket lifting mechanism; 5. second hanging basket grab; 10. first transfer device; 20. second transfer device; 30. first transfer trolley; 40. second transfer trolley; 50. spent fuel storage pool; 60. unloading pool; 70. first waterway; 80. second waterway. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] The present invention is further described in detail below with reference to specific examples. These examples should not be construed as limiting the scope of protection claimed in the present invention.

[0035] Example 1

[0036] According to one aspect of the present invention, a spent fuel transfer system is proposed. The nuclear power plant includes a spent fuel storage pool 50, two unloading pools 60 and at least two first water channels 70. The spent fuel transfer system includes at least two first transfer devices 10, at least one second transfer device 20 and at least two first transfer vehicles 30; the two unloading pools are respectively connected to the spent fuel storage pool 50 through at least two first water channels 70, at least one first water channel 70 is provided between one of the unloading pools 60 and the spent fuel storage pool 50, and each of the first water channels 70 is provided with The first transfer cart 30 is movable in the first waterway 70. The first transfer device 10 is positioned above the unloading pool 60. At least one first transfer device 10 is positioned above each spent fuel storage pool 50. The second transfer device 20 is positioned above the spent fuel storage pool 50. The first transfer device 10 is capable of grabbing spent fuel from the unloading pool 60 and placing it into the first transfer cart 30. The second transfer device 20 grabs spent fuel from the first transfer cart 30 and places it into the spent fuel storage pool 50. The bottom of the spent fuel storage pool 50 is higher than the bottom of the unloading pool 60. The angle between the top surface of the first waterway 70 and the horizontal plane is between 20° and 30°. The nuclear power plant includes two first waterways 70 and two second waterways 80. The spent fuel transfer system includes two first transfer carts 30, two second transfer carts 40, two first transfer devices 10, and one second transfer device 20.

[0037] Specifically, if Figure 1-2 As shown, a primary waterway is installed between each unloading pool and the spent fuel storage pool. The spent fuel storage pools can accommodate baskets, which are stacked side by side in a 4x6 arrangement, with transport channels between the groups. A primary transfer vehicle traverses the primary waterway between the unloading pool and the spent fuel storage pool, transporting the baskets via an underwater ramp. The entire operation is automatically controlled by a program, requiring only operator assistance at the control console.

[0038] By applying the above technical solution of the present invention, at least the following technical effects are achieved:

[0039] 1. The present invention includes two unloading pools and one spent fuel storage pool. The two unloading pools are connected to the spent fuel storage pool via at least two first water channels, with at least one first water channel provided between one of the unloading pools and the spent fuel storage pool. The two unloading pools and the at least two first water channels can operate simultaneously, or partially operate while the other serves as a backup, significantly improving the efficiency of spent fuel transfer.

[0040] Example 2

[0041] According to one aspect of the present invention, a spent fuel transfer system is proposed. A nuclear power plant includes a spent fuel storage pool 50, two unloading pools 60, and at least two first waterways 70. The spent fuel transfer system includes at least two first transfer devices 10, at least one second transfer device 20, and at least two first transfer vehicles 30. The two unloading pools are respectively connected to the spent fuel storage pool through at least two first waterways. At least one first waterway is provided between one of the unloading pools and the spent fuel storage pool, and each of the first waterways is provided with the first waterway. A transfer cart 30 is configured to move within the first waterway 70. A first transfer device 10 is positioned above the unloading pool 60. At least one first transfer device 10 is positioned above a spent fuel storage pool 50. A second transfer device 20 is positioned above the spent fuel storage pool. The first transfer device is capable of grabbing spent fuel from the unloading pool and placing it onto the first transfer cart. The second transfer device 20 grabs spent fuel from the first transfer cart 30 and places it into the spent fuel storage pool 50. The bottom of the spent fuel storage pool 50 is higher than the bottom of the unloading pool 60. The angle between the top surface of the first waterway 70 and the horizontal plane is between 20° and 30°. The nuclear power plant includes two first waterways 70 and two second waterways 80. The spent fuel transfer system includes two first transfer carts 30, two second transfer carts 40, two first transfer devices 10, and one second transfer device 20.

[0042] Specifically, if Figure 1-2 As shown, a primary waterway is installed between each unloading pool and the spent fuel storage pool. The spent fuel storage pools can accommodate baskets, which are stacked side by side in a 4x6 arrangement, with transport channels between the groups. A primary transfer vehicle traverses the primary waterway between the unloading pool and the spent fuel storage pool, transporting the baskets via an underwater ramp. The entire operation is automatically controlled by a program, requiring only operator assistance at the control console.

[0043] The spent fuel in the unloading pool is stored in the form of spent fuel assemblies. The spent fuel assemblies are loaded into a hanging basket and transported to the spent fuel storage pool. The first transfer device includes a fuel assembly gripper 3 and a hanging basket gripper 4. The first transfer device grabs the fuel assemblies in the unloading pool through the fuel assembly gripper 3 and places them into the hanging basket. The first transfer device grabs the hanging basket through the hanging basket gripper 4 and places it into the first transfer trolley. The first transfer device includes an unloading trolley 2 and an unloading cart 1. The unloading trolley can move along the unloading cart. The hanging basket gripper 4 and the spent fuel assembly gripper 3 are both arranged on the same unloading trolley 2. The central axes of the hanging basket gripper 4 and the spent fuel assembly gripper 3 extend vertically and are parallel to each other.

[0044] Specifically, if Figure 3 As shown, the first transfer device is equipped with different air pipes to drive the spent fuel assembly gripper and the basket gripper. The spent fuel assembly gripper can grasp both the assembly and the basket lid; the basket gripper can grasp the basket and also unlock and lock the lid. The opening and closing drives of the basket and spent fuel assembly grippers do not serve as load-bearing structures. Their locking and release are equipped with corresponding drives and mechanical or electrical protection mechanisms. Release operations can only be performed after unlocking.

[0045] The spent fuel assembly gripper 3 includes a spent fuel assembly fixed sleeve 31, a spent fuel assembly telescopic sleeve 32, and a spent fuel assembly grab hook 33. The spent fuel assembly fixed sleeve 31 is fixed to the unloading trolley 2, and the spent fuel assembly grab hook 33 is disposed at the lower end of the spent fuel assembly telescopic sleeve 32. The spent fuel assembly telescopic sleeve 32 is movable along the spent fuel assembly fixed sleeve 31. The hanging basket gripper 4 includes a hanging basket fixed sleeve 41, a hanging basket telescopic sleeve 42, and a hanging basket grab hook 43. The hanging basket fixed sleeve 41 is fixed to the unloading trolley 2, and the hanging basket grab hook 43 is disposed at the lower end of the hanging basket telescopic sleeve 42. The hanging basket telescopic sleeve 42 is movable along the hanging basket fixed sleeve 41. The cross-sections of the spent fuel assembly fixed sleeve 31 and the spent fuel assembly telescopic sleeve 32 along the horizontal plane are circular, while the cross-sections of the hanging basket fixed sleeve 41 and the hanging basket telescopic sleeve 42 along the horizontal plane are quadrilateral.

[0046] The spent fuel assembly gripper 3 also includes a spent fuel assembly lifting mechanism 34, which is fixed to the unloading trolley 2 and located above the unloading trolley 2. The spent fuel assembly lifting mechanism 34 can drive the spent fuel assembly telescopic sleeve 32 to move in the vertical direction along the spent fuel assembly fixed sleeve 31, and the spent fuel assembly lifting mechanism 34 can drive the spent fuel assembly grab hook 33 to rotate along the vertical axis; the hanging basket gripper 4 also includes a hanging basket lifting mechanism 44, which is fixed to the unloading trolley 2 and located above the unloading trolley 2. The hanging basket lifting mechanism 44 can drive the hanging basket telescopic sleeve 42 to move in the vertical direction along the hanging basket fixed sleeve 41, and the hanging basket lifting mechanism 44 can drive the hanging basket grab hook 43 to rotate along the vertical axis. The spent fuel assembly lifting mechanism 34 is a hydraulic lifting mechanism, and the hanging basket lifting mechanism 44 is a hydraulic lifting mechanism.

[0047] Specifically, if Figure 3 As shown, the spent fuel assembly lifting mechanism 34 and the basket lifting mechanism 44 each utilize two independent hydraulic lifting mechanisms. These mechanisms conserve operating space and enable precise positioning. The lower portion of the hydraulic cylinder is connected to a gripper, driving the gripper to raise and lower the load, completing the loading and unloading process. Hydraulic oil, coupled with a strict mechanical seal, can be used, as well as other liquids that will not contaminate the unloading pool water. Specifically, the spent fuel assembly lifting mechanism has a lifting capacity of 2 tons and a lifting stroke of 7 meters; the basket lifting mechanism has a lifting capacity of 12 tons and a lifting stroke of 1.5 meters. Their overall positioning accuracy is ±3 mm.

[0048] In other embodiments, both the spent fuel assembly lifting mechanism 34 and the hanging basket lifting mechanism 44 may be wire rope lifting mechanisms.

[0049] The nuclear power plant also includes a head-end processing facility and at least two second waterways. The spent fuel transfer system also includes at least two second transfer carts. The second waterways connect the spent fuel storage pool and the head-end processing facility. At least two second waterways are arranged between the spent fuel storage pool and the head-end processing facility. A second transfer cart is arranged in each second waterway, and the second transfer cart can move in the second waterway. The second transfer device includes a second hanging basket grab 5. The second transfer device grabs the hanging basket in the spent fuel storage pool through the second hanging basket grab 5 and places it into the second transfer cart.

[0050] Specifically, if Figure 4 As shown, the second transfer device is used for the transfer operation of the hanging basket in the spent fuel storage water pool. Figure 5As shown, the second transfer vehicle has essentially the same structure and function as the first. It traverses the second waterway between the spent fuel storage pool and the headend processing facility, enabling underwater ramp transport of the basket. The hoisting mechanism of the second transfer device has a lifting capacity of 12 tons and a lifting stroke of 1.5 meters. Its overall positioning accuracy is ±3mm.

[0051] The cross-section of the spent fuel storage pool opening is rectangular, the directions in which the first water channel and the second water channel extend are perpendicular to the long side of the spent fuel storage pool, and the line connecting the spent fuel receiving area through the unloading pool and the spent fuel storage pool to the headend processing facility is perpendicular to the long side of the spent fuel storage pool. Figure 1 As shown,

[0052] The bottom of the headend processing facility is higher than the bottom of the spent fuel storage pool, and the angle between the upper surface of the second waterway and the horizontal plane is between 25° and 30°. The upper surfaces of the first and second waterways are both provided with guide rails, and the first and second transfer carts are both provided with rollers.

[0053] Specifically, if Figure 2 As shown, the angle between the upper surface of the second water channel and the horizontal plane is approximately 27.5°. The unloading pool and the spent fuel storage pool are connected by a first water channel. The first water channel is provided with underwater sealing doors at the positions where it is connected to the unloading pool and the spent fuel storage pool respectively. A first transfer trolley and its travel track are provided in the water channel, and the hanging basket is placed on the first transfer trolley. The track and support are made of stainless steel, which must meet the strength requirements of the first and second transfer trolleys running at full load, as well as the hardness and rigidity requirements. At the same time, the structural form of the track and support is designed according to the machinability, weldability, and installation adjustability of the track material. More specifically, the second transfer trolley is driven by a drive mechanism, has a load capacity of 12t, and a positioning accuracy of ±3mm.

[0054] During the process of grasping the spent fuel assembly or basket by the first transfer device and the second transfer device, the spent fuel assembly and the basket remain below the water surface. During the process of transporting the basket by the first transfer vehicle and the second transfer vehicle, the basket remains below the water surface. Specifically, using the basket as the operating unit requires a smaller depth for the unloading and spent fuel storage pools than for the grid solution. The depth of the spent fuel storage pool can be reduced to approximately 9 meters, reducing water consumption by 1 / 4 compared to grid storage. This reduces the impact of the unloading and spent fuel storage pool loads on the building, even with the same storage capacity.

[0055] By applying the above technical solution of the present invention, at least the following technical effects are achieved:

[0056] 1. The present invention includes two unloading pools and one spent fuel storage pool. The two unloading pools are connected to the spent fuel storage pool via at least two first water channels, with at least one first water channel provided between one of the unloading pools and the spent fuel storage pool. The two unloading pools and the at least two first water channels can operate simultaneously, or partially operate while the other serves as a backup, significantly improving the efficiency of spent fuel transfer.

[0057] 2. In the present invention, the first transfer device includes a fuel assembly gripper and a basket gripper. The first transfer device uses the fuel assembly gripper to grab the fuel assemblies from the unloading pool and place them in the basket. The basket gripper then grabs the basket and places it on the first transfer vehicle. This not only simplifies the complexity of the transfer device corresponding to the unloading pool but also improves the efficiency of spent fuel transfer.

[0058] 3. In the present invention, the second transfer device only grabs the hanging basket and does not need to insert or remove the spent fuel assembly. Under the condition of a certain thickness of the radiation shielding water layer, the depth of the spent fuel storage pool can be reduced accordingly to reduce the impact of the spent fuel storage pool load on the building.

[0059] The above are only a number of specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

[0060] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0061] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

Claims

1. A spent fuel transfer system, characterized in that: The nuclear power plant comprises a spent fuel storage pool (50), two unloading pools (60) and at least two first waterways (70); the spent fuel transfer system comprises at least two first transfer devices (10), at least one second transfer device (20) and at least two first transfer vehicles (30); The two unloading pools (60) are respectively connected to the spent fuel storage pool (50) through at least two first water channels (70), at least one first water channel (70) is provided between one unloading pool (60) and the spent fuel storage pool (50), and each first water channel (70) is provided with a first transfer vehicle (30), and the first transfer vehicle (30) is capable of moving in the first water channel (70); The first transfer device (10) is arranged above the unloading pool (60), at least one first transfer device (10) is arranged above a spent fuel storage pool (50), and the second transfer device (20) is arranged above the spent fuel storage pool (50). The first transfer device (10) can grab the spent fuel in the unloading pool (60) and place it in the first transfer trolley (30), and the second transfer device (20) grabs the spent fuel in the first transfer trolley (30) and places it into the spent fuel storage pool (50).

2. The spent fuel transfer system according to claim 1, characterized in that: The bottom surface of the spent fuel storage pool (50) is higher than the bottom surface of the unloading pool (60), and the angle between the upper surface of the first water channel (70) and the horizontal plane is between 20° and 30°.

3. The spent fuel transfer system according to claim 2, characterized in that: The spent fuel in the unloading pool (60) is stored in the form of spent fuel assemblies. The spent fuel assemblies are loaded into a hanging basket and then transported to the spent fuel storage pool (50). The first transfer device (10) includes a fuel assembly gripper (3) and a hanging basket gripper (4). The first transfer device (10) grabs the fuel assembly in the unloading pool (60) through the fuel assembly gripper (3) and places it into the hanging basket. The first transfer device (10) grabs the hanging basket through the hanging basket gripper (4) and places it into the first transfer trolley (30).

4. The spent fuel transfer system according to claim 3, characterized in that: The first transfer device (10) includes a discharge trolley (2) and a discharge trolley (1), wherein the discharge trolley can move along the discharge trolley, the hanging basket gripper (4) and the spent fuel assembly gripper (3) are both arranged on the same discharge trolley (2), and the central axes of the hanging basket gripper (4) and the spent fuel assembly gripper (3) extend in a vertical direction and are parallel to each other.

5. The spent fuel transfer system according to claim 4, characterized in that: The spent fuel assembly gripper (3) comprises a spent fuel assembly fixed sleeve (31), a spent fuel assembly telescopic sleeve (32), and a spent fuel assembly grab hook (33); the spent fuel assembly fixed sleeve (31) is fixed to the unloading trolley (2); the spent fuel assembly grab hook (33) is arranged at the lower end of the spent fuel assembly telescopic sleeve (32); and the spent fuel assembly telescopic sleeve (32) is capable of moving along the spent fuel assembly fixed sleeve (31); The hanging basket grabber (4) comprises a hanging basket fixing sleeve (41), a hanging basket telescopic sleeve (42), and a hanging basket grab hook (43); the hanging basket fixing sleeve (41) is fixed to the unloading trolley (2); the hanging basket grab hook (43) is arranged at the lower end of the hanging basket telescopic sleeve (42); and the hanging basket telescopic sleeve (42) can move along the hanging basket fixing sleeve (41).

6. The spent fuel transfer system according to claim 5, characterized in that: The cross-sections of the spent fuel assembly fixing sleeve (31) and the spent fuel assembly telescopic sleeve (32) along the horizontal plane are circular, and the cross-sections of the hanging basket fixing sleeve (41) and the hanging basket telescopic sleeve (42) along the horizontal plane are quadrilateral.

7. The spent fuel transfer system according to claim 6, characterized in that: The spent fuel assembly gripper (3) further comprises a spent fuel assembly lifting mechanism (34), the spent fuel assembly lifting mechanism (34) being fixed to the unloading trolley (2), the spent fuel assembly lifting mechanism (34) being located above the unloading trolley (2), the spent fuel assembly lifting mechanism (34) being capable of driving the spent fuel assembly telescopic sleeve (32) to move in a vertical direction along the spent fuel assembly fixed sleeve (31), and the spent fuel assembly lifting mechanism (34) being capable of driving the spent fuel assembly grab hook (33) to rotate along a vertical axis; The hanging basket grabber (4) further comprises a hanging basket lifting mechanism (44), wherein the hanging basket lifting mechanism (44) is fixed to the unloading trolley (2), and the hanging basket lifting mechanism (44) is located above the unloading trolley (2). The hanging basket lifting mechanism (44) can drive the hanging basket telescopic sleeve (42) to move in a vertical direction along the hanging basket fixed sleeve (41), and the hanging basket lifting mechanism (44) can drive the hanging basket grab hook (43) to rotate along a vertical axis.

8. The spent fuel transfer system according to claim 7, characterized in that: The spent fuel assembly lifting mechanism (34) is a hydraulic lifting mechanism or a steel wire rope lifting mechanism, and the hanging basket lifting mechanism (44) is a hydraulic lifting mechanism or a steel wire rope lifting mechanism.

9. The spent fuel transfer system according to claim 8, characterized in that: The nuclear power plant further comprises a head-end processing facility and at least two second waterways (80), and the spent fuel transfer system further comprises at least two second transfer vehicles (40). The second water channel (80) is connected to the spent fuel storage pool (50) and the head end processing facility. At least two second water channels (80) are provided between the spent fuel storage pool (50) and the head end processing facility. The second transfer vehicle (40) is provided in each second water channel (80). The second transfer vehicle (40) is capable of moving in the second water channel (80). The second transfer device (20) includes a second hanging basket grabber (5), and the second transfer device (20) grabs the hanging basket in the spent fuel storage pool (50) through the second hanging basket grabber (5) and places it into the second transfer trolley (40).

10. The spent fuel transfer system according to claim 9, characterized in that: The cross-section of the opening of the spent fuel storage pool (50) is rectangular, the directions in which the first water channel (70) and the second water channel (80) extend are both perpendicular to the long side direction of the spent fuel storage pool (50), and the line connecting the spent fuel receiving area through the unloading pool (60) and the spent fuel storage pool (50) to the head-end processing facility is perpendicular to the long side direction of the spent fuel storage pool (50).

11. The spent fuel transfer system according to claim 10, characterized in that: The bottom surface of the head-end processing facility is higher than the bottom surface of the spent fuel storage pool (50), and the angle between the upper surface of the second water channel (80) and the horizontal plane is between 25° and 30°.

12. The spent fuel transfer system according to claim 11, characterized in that: The upper surfaces of the first water channel (70) and the second water channel (80) are both provided with guide rails, and the first transfer trolley (30) and the second transfer trolley (40) are both provided with rollers.

13. The spent fuel transfer system according to claim 12, characterized in that: The nuclear power plant comprises two first water channels (70) and two second water channels (80), and the spent fuel transfer system comprises two first transfer vehicles (30), two second transfer vehicles (40), two first transfer devices (10) and one second transfer device (20).

14. The spent fuel transfer system according to claim 13, characterized in that: During the process of the first transfer device and the second transfer device (20) grabbing the spent fuel assembly or the hanging basket, the spent fuel assembly and the hanging basket are not higher than the water surface; during the process of the first transfer trolley (30) and the second transfer trolley (40) transporting the hanging basket, the hanging basket is not higher than the water surface.

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